9397972731 has 16 divisors (see below), whose sum is σ = 14707768064. Its totient is φ = 5225127264.

The previous prime is 9397972699. The next prime is 9397972733. The reversal of 9397972731 is 1372797939.

It is not a de Polignac number, because 9397972731 - 2⁵ = 9397972699 is a prime.

It is a super-2 number, since 2×9397972731² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9397972733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6046825 + ... + 6048378.

It is an arithmetic number, because the mean of its divisors is an integer number (919235504).

Almost surely, 2^9397972731 is an apocalyptic number.

9397972731 is a deficient number, since it is larger than the sum of its proper divisors (5309795333).

9397972731 is a wasteful number, since it uses less digits than its factorization.

9397972731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12095250.

The product of its digits is 4500846, while the sum is 57.

The square root of 9397972731 is about 96943.1417429825. The cubic root of 9397972731 is about 2110.3025651931.

The spelling of 9397972731 in words is "nine billion, three hundred ninety-seven million, nine hundred seventy-two thousand, seven hundred thirty-one".